uftrace for Clang LLVM

1. Download LLVM 8.0.1 and uncompress

$ wget https://github.com/llvm/llvm-project/releases/download/llvmorg-8.0.1/llvm-8.0.1.src.tar.xz
$ wget https://github.com/llvm/llvm-project/releases/download/llvmorg-8.0.1/cfe-8.0.1.src.tar.xz
$ tar xfx llvm-8.0.1.src.tar.xz
$ tar xfx cfe-8.0.1.src.tar.xz

2. Move clang source under llvm/tools

$ mv cfe-8.0.1.src llvm-8.0.1.src/tools/clang

3. Configuration

$ mkdir build.release.pg.g && cd build.release.pg.g

$ cmake -G Ninja ../llvm-8.0.1.src -DLLVM_TARGETS_TO_BUILD="host;ARM;AArch64" \
      -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-pg -g"

4. Build clang

$ ninja clang

5. Test the generated clang image

$ cd ./bin

$ ./clang
clang-8: error: no input files

$ nm clang | grep mcount
                 U mcount@@GLIBC_2.2.5

6. Run clang execution with uftrace

$ uftrace -F main -D 2 --no-libcall -- ./clang
clang-8: error: no input files
# DURATION     TID     FUNCTION
            [ 98244] | main() {
  24.430 us [ 98244] |   llvm::InitLLVM::InitLLVM();
   0.154 us [ 98244] |   llvm::SmallVectorImpl::append();
   7.227 us [ 98244] |   llvm::sys::Process::FixupStandardFileDescriptors();
   0.801 us [ 98244] |   LLVMInitializeARMTargetInfo();
   0.648 us [ 98244] |   LLVMInitializeAArch64TargetInfo();
   0.402 us [ 98244] |   LLVMInitializeX86TargetInfo();
 101.316 us [ 98244] |   LLVMInitializeARMTarget();
 147.455 us [ 98244] |   LLVMInitializeAArch64Target();
 201.976 us [ 98244] |   LLVMInitializeX86Target();
   8.783 us [ 98244] |   clang::driver::ToolChain::getTargetAndModeFromProgramName();
   0.070 us [ 98244] |   llvm::cl::ExpandResponseFiles();
  54.055 us [ 98244] |   GetExecutablePath::cxx11();
 814.121 us [ 98244] |   clang::driver::createDriverOptTable();
   3.336 us [ 98244] |   llvm::opt::OptTable::ParseArgs();
 153.992 us [ 98244] |   clang::ParseDiagnosticArgs();
   0.160 us [ 98244] |   llvm::opt::InputArgList::releaseMemory();
   1.026 us [ 98244] |   llvm::opt::OptTable::~OptTable();
   2.214 us [ 98244] |   llvm::errs();
   0.097 us [ 98244] |   clang::TextDiagnosticPrinter::TextDiagnosticPrinter();
   0.778 us [ 98244] |   llvm::sys::path::stem();
   0.194 us [ 98244] |   std::__cxx11::basic_string::_M_construct();
   0.068 us [ 98244] |   clang::DiagnosticIDs::DiagnosticIDs();
   6.672 us [ 98244] |   clang::DiagnosticsEngine::DiagnosticsEngine();
   0.471 us [ 98244] |   clang::ProcessWarningOptions();
   4.888 us [ 98244] |   llvm::sys::getDefaultTargetTriple::cxx11();
 647.745 us [ 98244] |   clang::driver::Driver::Driver();
   0.145 us [ 98244] |   llvm::SmallVectorImpl::append();
   0.500 us [ 98244] |   llvm::sys::path::filename();
  11.686 us [ 98244] |   llvm::sys::fs::make_absolute();
   0.363 us [ 98244] |   llvm::sys::path::parent_path();
   2.406 us [ 98244] |   llvm::sys::fs::access();
   1.789 ms [ 98244] |   clang::driver::Driver::BuildCompilation();
   0.475 us [ 98244] |   clang::driver::Driver::ExecuteCompilation();
   0.110 us [ 98244] |   clang::DiagnosticConsumer::finish();
   0.113 us [ 98244] |   llvm::errs();
   2.266 us [ 98244] |   llvm::TimerGroup::printAll();
   1.831 us [ 98244] |   clang::driver::Compilation::~Compilation();
  15.856 us [ 98244] |   clang::driver::Driver::~Driver();
   1.466 us [ 98244] |   clang::DiagnosticsEngine::~DiagnosticsEngine();
   0.220 us [ 98244] |   llvm::RefCountedBase::Release();
   0.454 us [ 98244] |   llvm::RefCountedBase::Release();
   0.111 us [ 98244] |   std::_Rb_tree::_M_erase();
 146.974 us [ 98244] |   llvm::InitLLVM::~InitLLVM();
   4.217 ms [ 98244] | } /* main */